How to Create and Update Offers Using JSON_LISTINGS_FEED

[impromani]

I am currently using the POST_FLAT_FILE_INVLOADER_DATA feed to submit data. This feed performs both actions—creating a new SKU if it doesn't exist and updating the SKU if it already exists.

I am planning to migrate from the POST_FLAT_FILE_INVLOADER_DATA feed to JSON_LISTINGS_FEED. However, after reviewing the documentation (linked below), I found that the provided examples only demonstrate how to update existing SKUs:
Listing Workflow Migration Tutorial.

{
 "operationType": "PATCH",
  "productType": "PRODUCT",
  "patches": [
    {
      "op": "replace",
      "path": "/attributes/purchasable_offer",
      "value": [
        {
          "currency": "USD",
          "our_price": [
            {
              "schedule": [
                {
                  "value_with_tax": 90.00
                }
              ]
            }
          ],
          "minimum_seller_allowed_price": [
            {
              "schedule": [
                {
                  "value_with_tax": 80.00
                }
              ]
            }
          ],
          "maximum_seller_allowed_price": [
            {
              "schedule": [
                {
                  "value_with_tax": 100.00
                }
              ]
            }
          ]
        }
      ]
    },
    {
      "op": "replace",
      "path": "/attributes/fulfillment_availability",
      "value": [
        {
          "fulfillment_channel_code": "DEFAULT",
          "quantity": 5,
          "lead_time_to_ship_max_days": 1
        }
      ]
    }
    ... (more patches, if applicable)
  ]
}

I attempted to use the JSON_LISTINGS_FEED for this purpose, but it only updates existing SKUs and does not create new ones.

Could you please suggest a way to achieve both actions (create and update) in a single API call, similar to how it works with the previous feed?

Below are the feed attributes I am currently using with POST_FLAT_FILE_INVLOADER_DATA:

• sku
• price
• minimum-seller-allowed-price
• maximum-seller-allowed-price
• quantity
• product-id
• product-id-type
• item-condition
• item-note

Any guidance would be greatly appreciated!